The Principality Stadium roof will be closed for Saturday's Six Nations opener between Wales and Scotland "following a dramatic new twist in the saga".
McGuigan knows this to be the case but says he is relaxed about the fact that he might not be given quite as much opportunity to launch those powerful runs which lit up Murrayfield last November, and which have helped him claim eight tries in the Aviva Premiership so far this season - second only to Josh Adams, who happens to be his opposite number this weekend.
Rhys Patchell has been handed the cherished outside-half jersey in the absence of Dan Biggar and will partner his regional colleague Gareth Davies.
Flankers Josh Navidi and Aaron Shingler were vast, justifying the decision to select Lion Justin Tipuric as a replacement, and the tight five did the dirty work but also threw in some cute touches. Cory Hill is alongside captain Alun Wyn Jones at lock.
The Scarlets full-back has come under growing pressure for a starting spot after injuries and loss of form.
With Scotland missing up to six front five players through injury, hooker Owens insists Wales will attempt to gain the upper hand in the scrum.
"It is hard to find positives, Wales were superior today and we have a lot of work to do".
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"We went to Murrayfield past year with a view of being dominant, which we were for large parts of the game, but a couple of scrums went down, we brought the referee into it, and then some 50-50 calls went against us".
Playing in the Principality Stadium - Barclay scored in the infamous 2010 game but doesn't remember much other than "all the injuries and the insane last ten minutes" - will inspire the Welsh but also the Scots, the skipper added.
The latter part was beyond them, however, as Stef Evans brilliantly finished in the corner, and although the final pass from Hadleigh Parkes looked like it could have been forward, that element was not reviewed by the TMO.
"The talk within our camp is that we are trying to maintain our attacking rugby however people view the way we play - that's our sole focus".
Scotland's 36-year-old hooker Scott Lawson, who has not played an worldwide since 2014, provides cover on the bench in a further reflection of the selection crisis among the forwards for coach Gregor Townsend.
Gareth Davies gave the hosts the ideal start, the scrum-half intercepting an Ali Price pass to race over from the halfway line.
Ali Price and Finn Russell form a risky half back partnership.
"That was a massive performance", said the back-row.